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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f7cdc27ac6f609f0f51a44b0ad5754bf75a8e5e6df35042b80547c7b2f509d' 
  AND token = '2fUinJQOMdlSZpShXbzW7arNoqhxTqCLBHiXDkMtFhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}